configure: fix clang-cl detection

When using clang-cl it expects parameters passed in MSVC-style, so appropriate toolchain should be selected.
As soon as both clang and clang-cl report themselfs as "clang" with -v option the only chance to detect
clang-cl is passing -? option to both which is valid for clang-cl.exe and not for clang.exe.

Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/configure b/configure
index 36e425be62aa96995937772c1d138decb9f5a920..a6f32f8d9abf23ec387e25434d4bff10669c0606 100755 (executable)
--- a/configure
+++ b/configure
@@ -4339,7 +4339,7 @@ probe_cc(){
         _depflags='-MMD'
         _cflags_speed='-O3'
         _cflags_size='-Os'
-    elif $_cc -v 2>&1 | grep -q clang; then
+    elif $_cc -v 2>&1 | grep -q clang && ! $_cc -? > /dev/null 2>&1; then
         _type=clang
         _ident=$($_cc --version 2>/dev/null | head -n1)
         _depflags='-MMD -MF $(@:.o=.d) -MT $@'
@@ -4410,7 +4410,7 @@ probe_cc(){
         _flags_filter=msvc_flags
         _ld_lib='lib%.a'
         _ld_path='-libpath:'
-    elif $_cc -nologo- 2>&1 | grep -q Microsoft; then
+    elif $_cc -nologo- 2>&1 | grep -q Microsoft || $_cc -v 2>&1 | grep -q clang && $_cc -? > /dev/null 2>&1; then
         _type=msvc
         _ident=$($_cc 2>&1 | head -n1 | tr -d '\r')
         _DEPCMD='$(DEP$(1)) $(DEP$(1)FLAGS) $($(1)DEP_FLAGS) $< 2>&1 | awk '\''/including/ { sub(/^.*file: */, ""); gsub(/\\/, "/"); if (!match($$0, / /)) print "$@:", $$0 }'\'' > $(@:.o=.d)'